| /* |
| * Copyright 2014, NICTA |
| * |
| * This software may be distributed and modified according to the terms of |
| * the BSD 2-Clause license. Note that NO WARRANTY is provided. |
| * See "LICENSE_BSD2.txt" for details. |
| * |
| * @TAG(NICTA_BSD) |
| */ |
| /* |
| * A default crt0 for ia32. It does the bare minimum required to get into |
| * main() with a sensible C environment. |
| * |
| * This file will only be linked in if: |
| * - no other file already provides a _start symbol, and |
| * - _start is an undefined external symbol (force this by passing |
| * "-u _start" to ld). |
| */ |
| |
| #define __ASM__ |
| #include <autoconf.h> |
| |
| #ifdef CONFIG_LIB_SEL4_PLAT_SUPPORT_START |
| |
| #include <sel4/arch/constants.h> |
| |
| .global _start |
| |
| .text |
| |
| #ifdef X86_64 |
| |
| .align 0x1000 |
| _start: |
| leaq _stack_top, %rsp |
| |
| /* Setup segment selector for IPC buffer access. */ |
| movw $IPCBUF_GDT_SELECTOR, %ax |
| movw %ax, %gs |
| |
| # setup the bootinfo |
| movq %rbx, %rdi |
| call seL4_InitBootInfo |
| |
| /* Call constructors and other initialisation functions. */ |
| call _init |
| |
| call main |
| # the return value is in rax |
| movq %rax, %rdi |
| call exit |
| |
| 1: jmp 1b |
| |
| #else |
| |
| _start: |
| leal _stack_top, %esp |
| |
| /* Setup segment selector for IPC buffer access. */ |
| movw $IPCBUF_GDT_SELECTOR, %ax |
| movw %ax, %gs |
| |
| /* Setup the global "bootinfo" structure. */ |
| pushl %ebx |
| call seL4_InitBootInfo |
| addl $4, %esp |
| |
| /* Call constructors and other initialisation functions. */ |
| call _init |
| |
| /* Start main. */ |
| call main |
| |
| /* Call exit with the return value from main. */ |
| pushl %eax |
| call exit |
| 1: jmp 1b |
| |
| #endif |
| |
| .bss |
| .align 8 |
| |
| _stack_bottom: |
| .space 16384 |
| _stack_top: |
| |
| #endif /* CONFIG_LIB_SEL4_PLAT_SUPPORT_START */ |
